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HelicopterThunder TigerOther › Raptor 50V2
03-13-2003 01:36 AM  14 years agoPost 1
Scooterpilot

rrKey Veteran

Southern, California

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Hi All,

I'm having a problem with my R 50V2 wobbling. This occures at certain RPM while decending for landing. About 20 feet from the ground when the blades are slowing down before power is applied to land. It's not a minor shake it's a major one. This only happens in normal flight mode. When I'm in idle up 1or 2 at 1850 RPM there is no problem at all.

Motor is an OS 50.

Things I've checked or done to try to fine out where the problem is:

I geased the spindle.
Rechecked the blade balance on the Maverick blades. They are fine
checked the mast. It's straight
Leaned the motor some more....no improvement.
Tried to richen the motor .......no improvement.
Checked the tail rotor. No problem it's straight.
Checked the slipper clutch, no problem there
No up and down play in the mast.

All ideas are welcome.

Thanks

Team Thunder Tiger, Team Futaba, Two G-4's, Two X50's YS60SR,Tx12Z/14FG,YSRep,RailBlades/S

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03-13-2003 02:37 AM  14 years agoPost 2
HelicopterJohn

rrKey Veteran

Seffner, Florida​(Just East of Tampa,​Florida)

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Wobbles

Try either "loosening" or "tightening" the bolts in the blade holders. It sounds like one or both of the blades are "leading/lagging" and causing it to wobble at a "certain stick position" in normal mode.

The other thing you might want to look at is the throttle and pitch curves of the normal rate mode. Adjust as necessary at the "throttle position" where the wobble is taking place in the normal mode.

Just a couple of ideas you might want to try.

OC Bob's Gathering #2 was a Premiere Event. Pictures in my Gallery

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03-13-2003 02:45 AM  14 years agoPost 3
Alan Szabo Jr

rrApprentice

Las Vegas, Nevada

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wobble

Helicopter John has a couple of good suggestions there. Also in you normal mode during your decent you should not here the engine rpm decrease. It should maintain a constant rpm. You should be able to put it on the ground and then pull back on the throttle stick and here the throttle slow down.

Alan Szabo Jr.

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03-13-2003 04:19 AM  14 years agoPost 4
Scooterpilot

rrKey Veteran

Southern, California

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Raptor 50V2

Gentlemen,

Thanks for your comments. I'll check on the blades and throttle curves Friday. I'll respond with a post to let you know how it worked out.

I appreciate you taking your time to respond.

Regards,

Team Thunder Tiger, Team Futaba, Two G-4's, Two X50's YS60SR,Tx12Z/14FG,YSRep,RailBlades/S

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03-13-2003 08:45 AM  14 years agoPost 5
G.Man

rrProfessor

Bristol

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The blue dampers setup a slight reverb in the model at a certain headspeed...

this appears as the model shaking side to side under the rotor disk...almost as if you are wiggling the aileron quickly side to side..

more headspeed cures it..

Hope this helps, apparently it improves as the dampers wear in..

Don't Email me as I wont reply - PM Only (spam countermeasures)

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03-13-2003 11:22 AM  14 years agoPost 6
garry keogh

rrApprentice

Wicklow, Ireland

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Wobble

I too have had this wobble in my R30 V1 with an OS32. I have training undercarriage on my heli which is made of fiberglass tubes that press into a plastic hub with big balls on the ends.
I found that my hover throttle pitch settings must always be biased towards keeping the head quite slow . Something like T=47% P=53% seems OK. If I raise the head speed at hovering settings, as I close the throttle/pitch to descend a little, the heli goes into a severe wobble, the main shaft seeming to orbit around the drive gear area.
What you see is the top of the main shaft wobbling severely (over an inch left/right) and the training gear getting into a sort of harmonic that seems to make it worse, the area about the main gear and tail boom stays quite still. It really looks like it is about to shake something off in a big hurry.
The only way I have collected it in the past was to dump the collective and let it fall hard, then feed in collective and gently bounce the training gear off the grass. Thankfully I have not managed to hit hard yet.

Now I too have a problem in deciding what causes it. It looks like a particular frequency in the heli is picking up a harmonic in the training gear. I shortened each leg on the training gear about 1.5" to see if it still happens and yes, but a little higher up in the head speed department.

The heli has only flown once or twice without the training gear and I am nearvous to try and dump it in a hurry without the extra bounce of the training gear. I will just have to pluck up the courage.

FYI, I have been running my blade grips tighter than originally for the last few sessions and it did happen a couple of weeks ago. I took it apart after it happened the first time and checked the spindle and mainshaft for runout on a lathe with a diall gauge. Not as much as a budge on the diall! I regreased the spindle and dampers with proprietary rubber grease and it still happens.

Any suggestions welcomed . . . however daft (to a point, please)

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03-13-2003 02:16 PM  14 years agoPost 7
Waldo

rrVeteran

Middle of the corn​patch (Iowa)

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The two main causes for the wobble are low head speed and not enough grease on the spindle. Since you have the spindle well lubed then I'd recommend increasing the head speed.

Gary, training gear have been known to really cause some problems on Raptors, shortening the rods is one fix and you've done that, using lots of rubber bands to really hold them down tight is another.
The only way I have collected it in the past was to dump the collective and let it fall hard, then feed in collective and gently bounce the training gear off the grass. Thankfully I have not managed to hit hard yet.
If you can do that I'd say its time to get rid of the training gear.

[b]Bill[/b]

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03-14-2003 11:56 PM  14 years agoPost 8
Scooterpilot

rrKey Veteran

Southern, California

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PROBLEM SOLVED

Hi All,

I checked and did everything as everyone recommended. Then I decided to check the PV0382 80 Duro dampners V2 that I installed and replace them with a softer dampner. After installation of the softer dampner the problem went away. I should have thought of that first because the problem starting happening right after I installed them.

Again, everyone thanks for the help.

Regards,

Team Thunder Tiger, Team Futaba, Two G-4's, Two X50's YS60SR,Tx12Z/14FG,YSRep,RailBlades/S

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03-15-2003 12:07 AM  14 years agoPost 9
Happychappy

rrApprentice

UK

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Hey Scooterpilot....

send the blue dampers over 'ere to to the UK, cos we still can't get them as an spare part :-(

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04-01-2003 04:40 PM  14 years agoPost 10
davej

rrApprentice

Tiptree Essex​England

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Peculiar one this my V2 bought from Cyberheli in January has the original black damper rubbers and is nice and stable in hover and FFF, whereas my mates V" bought from LHS here in uk has blue damper rubbers and is a little nervous in flight has a slight nod in FFF and is not so stable in the hover.

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04-01-2003 08:00 PM  14 years agoPost 11
Vance

rrVeteran

York ,PA

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I read in one of the magazines that TT is going to be shipping the raptors with the blue dampers.
Vince D

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04-01-2003 08:16 PM  14 years agoPost 12
giaffa

rrApprentice

Sao Paulo - BRAZIL

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Blue Dampers

I got my 50V2 from rick's a couple of weeks ago and they did came with the blue dampers.

Affonso

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